Process and furnace for reducing and roasting ores



Mar. 13, 1923. r 1,448,340,

E. FLEISCHER. D

PROCESS AND FURNACE FOR REDUCING AND ROASTING ORES.

FILED Aue.2|,19'|7.

'lllllllllll V YIIIIIIIIII EMIL ILEISCHER, F DRESiDEN, GERMANY, ASSIGNOR, BYMESNE ASSIGNMENTS, TO THE CHEMICAL FOUN DATION', INQ, A CORPORATION OF DELAWARE.

rnocnss am) summon ron melanoma AND noasrnm onns.

Application filed August 21, 1917. Serial No. 187,898..

To all it may concern Be it known that I, Dr. EMIL FLEIsoHER, chemist, a subject of the German Emperor,

' and residentof Dresden, Germany,-have inwhich I have file vented new and useful Processesand Furnaces for Reducin and Roasting Oires (for dam application in Ger: many, October 26, 1916), of which the-following is a specification.

The process forming the subject matter of the present invention has as its object the reduction of ores by means of a very hot reducing gas. The heating or roasting of the ore shallv be-performed 1n the sameappa ratus, and the gas and air volumes employed therefor must be adjustable. Be-

sides it is intended that the still very hot waste gases of the reduction process, which still contain a large amount of fuel, be utilized to a small degree only for heating and roasting, and to their greater part for another purpose and be conducted away for the same. With these objects in view the following process is employed. 0

Of the whole ore burden filled into the reducing and roasting furnace, which has the form of a shaft divided by constructions into several chambers, only the lower part serves for reduction purposes, whereas the upper part serves to heat-up or roast the ore. Be-

tween the said two sections, however, an inter-' med ate zone must be interposed. The mtermediate zone will be penetrated from below by a small adjustable volume of the waste gases from t e reduction process, the same waste gases being burnt by aid of air introduced thereto above the intermediate zone, so as to heat or roast the ore lying thereabove. The greater part of the waste gases from the re duction process, however, leaves the apparatus below the intermediate zone, in order to be utilized for other purposes.

In the accompanying drawing the apparatus for carrying out'the present invention is shown in longitudinal section. This apparatus consists of a furnace of the shaft type, in which protruding walls divide the ore charge into a series of sections separated from each other by gas chambers. In the said drawing V indicates the heating or roasting section, Z is the intermediate section and R is the reducing section of the ore charge. The hot gas for reducing the ore enters into the furnace at E. K is a cooling chamber, from which-the reduced ore may be tapped from "time to time through 7:. Above .the furnace is disposed a hopper F provided with a closure.

or operating thefurnace described a rei ducmg' (gas is introduced through. the gas nozzles G 1nto the ore charge; the heat ofthis; gas should'not be lower than the reduc mg temperature of the respective ore. After the said as has passed through the reducing sectlon lts main'volume escapes through "A as a hot combustible waste gas to be used for other purposes, for purposes' If, now, the gate S, through which the roasting gases escape in pipe 1 is not closed, a part of the waste gases from the reduct1on will penetrate the intermediate section Z, wlthout, however, being here fully oxid zed-- By air bein blown in through the pe L and the regu ating valvegfihe gas is example for smelting c sumed and the fire gases will heat the ore in he heating and roasting section V. Besides the air regulating at xv the volume of gas flowing through the intermediate sec tlon may a so be controlled bythe gate S, so

that the temperature of the heating sectioir V and degree to which the ore is oxidized may be regulated'at will. In place of pure air, also a mixture of air and steam may be blown into the furnace at L.

I claim:

1. The herein described process for the treatmentof ore which comprises passing a reducing gas through a large body of ore of inverted conical form, removing the major portion of the reducing gas at the" upper end of said body of ore, drawing the remainder of the reducing gas through a second large body of ore, also of inverted conical form, firing the reducing gas at the upper portion of said second body of ore, and then drawing the fired third body of ore of conical orm arran ed above the second body of ore, substantia lly as described.

as through a 2. A furnace for simultaneously heating or roasting and reducin ores, composed of a heating or roasting c amber adapted to .hold a large volume of ore in the gangue, 'acontraction in'the furnace at thebase of said heating chamber, an intermediate chamber below said contraction, a contraction at the base of said intermediate chamher, a reducing chamber below said intermediate chamber and second-named contraction, means for introducing'a reducing gas at high temperature to the lower part of said reducing chamber, an outlet for the greater part of the reducing gas at the upper part of said reducingh chamber, means for drawing a portion of t gas up into and through the intermediate chamber, and an air supply in the upper part of said intermediate chamber for firing said reducing gas before the latter enters the heating chamber.

3. A furnace including a heating or roasting' chamber of inverted conical shape having a capacity to receive a large quantity of ore in the gangue and adapted to hold the ore unmoved therein during the roasting process, a hopper for introducing ore in the gangue to said chamber, a device for closlng the communication between said hopper and chamber, an outlet at the upper part of said chamber, a valve controlling said outlet, a I

second inverted conical chamber beneath e Waste reducing raaeeao and communicating with said first-named chamber also for holding unmoved alar e volume of ore in the gangue, a controllab eair inlet at the upper part of said second chamber, a third inverted conical chamber holding a large amount ct ore in the gangue thereof, and an outlet at the bottom of the.

last-named chamber for the removal of the I reduced ore, substantially as described In testimony, that llclaim the foregoing as my invention, I have sied my name in presence of two Witnesses, this 7th day of July, 1917. 1-

Dn. EMJIL FLEISCHER. Witnesses:

Rrou Wmrnr, Manama Lem. 

